Primary desminopathies

Area of Science:

• Muscle Biology
• Genetics
• Pathology

Background:

• Desminopathies are myopathies linked to mutations in the human desmin gene (chromosome 2q35).
• These conditions manifest as skeletal and cardiac muscle disorders, characterized by cytoplasmic desmin accumulation and myofibrillar alterations.
• Desmin aggregates and myofibrillar abnormalities also define secondary desminopathies, a heterogeneous group of neuromuscular diseases.

Purpose of the Study:

• To provide an overview of desmin's function in striated muscle.
• To detail the clinical, myopathological, genetic, and pathophysiological aspects of primary desminopathies.
• To discuss recent advances in differentiating primary from secondary desminopathies.

Main Methods:

• Literature review of functional, clinical, and genetic studies on desminopathies.
• Analysis of morphological hallmarks in skeletal and cardiac muscle tissues.
• Review of recent genetic and biochemical findings.

Main Results:

• Primary desminopathies result from desmin gene mutations, leading to characteristic protein aggregates and myofibrillar changes.
• Secondary desminopathies share morphological features but stem from diverse genetic and etiological factors.
• Distinguishing between primary and secondary forms is essential due to their varied underlying mechanisms.

Conclusions:

• Desmin plays a critical role in striated muscle structure and function.
• Primary desminopathies are directly caused by desmin gene mutations, while secondary forms involve desmin pathology secondary to other causes.
• Advances in genetic and biochemical analyses are improving the diagnostic distinction between these myopathy types.